Village spawning: Use gennotify

mods/village/mapgen.lua

@@ -47,60 +47,41 @@ minetest.register_node(
       end,
 })
 
+-- TODO: Remove
 minetest.register_node(
    "village:grassland_village_mg",
    {
-      description = S("Mapgen Village Spawner").."\n"..S("(Has chance of not spawning village)"),
-      inventory_image = "village_gen_mg.png",
-      wield_image = "village_gen_mg.png",
-      drawtype = "airlike",
+      description = S("Legacy Mapgen Village Spawner"),
+      tiles = {"village_gen_mg.png"},
+      drawtype = "normal",
       paramtype = "light",
       sunlight_propagates = true,
       walkable = false,
-      pointable = false,
-      diggable = false,
+      pointable = true,
+      diggable = true,
       buildable_to = false,
       is_ground_content = true,
-      air_equivalent = true,
       drop = "",
-      groups = {not_in_craft_guide = 1, not_in_creative_inventory=1},
+      groups = {not_in_craft_guide = 1, not_in_creative_inventory=1, dig_immediate = 2},
 })
 
--- Spawning LBM
-
-minetest.register_lbm(
-   {
-      name = "village:spawn_village",
-      label = "Village spawning",
-      nodenames = {
-         "village:grassland_village_mg",
-      },
-
-      run_at_every_load = true,
-
-      action = function(pos, node)
-         minetest.remove_node(pos)
-
+local function attempt_village_spawn(pos)
+    local spos = table.copy(pos)
+    spos.y = spos.y + 1
     if minetest.settings:get_bool("mapgen_disable_villages") == true then
         return
     end
 
-         local pr = PseudoRandom(mapseed
-                                    + pos.x + pos.y + pos.z)
+    local pr = PseudoRandom(mapseed + spos.x + spos.y + spos.z)
 
-         if ((mapseed + pos.x + pos.y + pos.z) % 30) == 1 then
-            local nearest = village.get_nearest_village(pos)
+    if ((mapseed + spos.x + spos.y + spos.z) % 30) == 1 then
+       local nearest = village.get_nearest_village(spos)
 
        if nearest.dist > village.min_spawn_dist then
-               if vector.distance(spawn_pos, pos) > spawn_radius then
-                  minetest.log("action", "[village] Spawning a Grassland village at " .. "(" .. pos.x
-                                  .. ", " .. pos.y .. ", " .. pos.z .. ")")
-
-                  minetest.after(
-                     2.0,
-                     function(pos, pr)
-                        village.spawn_village(pos, pr)
-                  end, pos, pr)
+          if vector.distance(spawn_pos, spos) > spawn_radius then
+             minetest.log("action", "[village] Spawning a grassland village at " .. "(" .. spos.x
+                             .. ", " .. spos.y .. ", " .. spos.z .. ")")
+             village.spawn_village(spos, pr)
           else
              minetest.log("action", "[village] Cannot spawn village, too near the static spawnpoint")
           end
@@ -108,15 +89,16 @@ minetest.register_lbm(
           minetest.log("action", "[village] Cannot spawn village, too near another village")
        end
     end
-      end,
-})
-
--- Spawn decoration
+end
 
+local village_decoration_id
 if not minetest.settings:get_bool("mapgen_disable_villages") then
+   -- Dummy decoration to find possible village spawn points
+   -- via gennotify.
    minetest.register_decoration(
       {
-         deco_type = "simple",
+         name = "village_grassland",
+         deco_type = "schematic",
          place_on = "default:dirt_with_grass",
          sidelen = 16,
          fill_ratio = 0.005,
@@ -124,10 +106,29 @@ if not minetest.settings:get_bool("mapgen_disable_villages") then
             "Grassland",
             "Forest"
          },
-         decoration = {
-            "village:grassland_village_mg"
+         -- empty schematic
+         schematic = {
+             size = { x = 1, y = 1, z = 1 },
+             data = {
+                 { name = "air", prob = 0 },
+             },
          },
          y_min = 1,
          y_max = 1000,
    })
+   village_decoration_id = minetest.get_decoration_id("village_grassland")
+
+   if village_decoration_id then
+       minetest.set_gen_notify({decoration=true}, {village_decoration_id})
+       minetest.register_on_generated(function(minp, maxp, blockseed)
+           local mgobj = minetest.get_mapgen_object("gennotify")
+           local deco = mgobj["decoration#"..village_decoration_id]
+           if deco then
+               for d=1, #deco do
+                   attempt_village_spawn(deco[d])
                end
+           end
+       end)
+   end
+end
+